The calculated distance (air line) between As Sulaymānīyah and Dihok is approximately 163 miles respectively 263 kilometers.
By car or train, the actual journey to Dihok is certainly longer, as only the direct route (as the crow flies) between As Sulaymānīyah and Dihok has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles